Grinding stone



Dec. 6, i927. 1,651,533

A. E. MAYNARD GRINDING STONE` Filed April '7, 1926 I Nl' 54 albert 2;.magma;

i PatentedgDecQ, 1927. i, Y' l f ugNlrEgDfgsrA-rss ALBERT n. MAYNARD,,or soUTHBnIDGn, livr/Asssonusnrfrs, Assiolfnon @AMERICAN oPTIeALCOMPANY, or seu'rfnnnrnen'rmsseormsnrrs .A v oLUNTAn Associafrron oFMASSACHUSETTS.

Application led Apri-1 7,

v l`rThe l.present invention relatesv to an improvedforrn of dealing or'iv-abbly grinding to be edged.

l' The principal object of the invent-ion is to f provide a mounting ofthisV nature wherein the emersi` .Stenen-ill be "Sensitive to theirregularities in the contour ,of the lens to be edged, said mountingpermitting .of both faces :lof the l,said lens to be edgedSimultaneously Another lbject of -the invention is to provide, in astone mounting of this natule, means whereby 'a substantially evenamount ofdriv-ing pressure `Will 'be maintained during the grinding v.operation regardless yof what angle the stone maybe tilted or rocked.Another object is Vto provide a de-.vice of this nature that `willbestrong, durable, simple. and inexpensive '-i-n construction, ,and

which iti-is designed.- l l f Y Qthenobjeots and advantages will be'apthat will be wellfadapted for-the uses for parent by reference to thefollowing; specification talren'in connectionwith the accompanyingdrawings, and 1t will -be understood that. I may ima-ke anymodifications in 'the Y specific details-fof construction shown. and

described within the scope of the appended claims without departing from`or exceeding the spiritof the invention. The preferredr form .of theinvention only has been shown and described by way of illustration.

Referring to the drawings:

Figure 1 is a side elevation of the stone and stone mounting;

Figure 2 is a view of a section on line 2-2 of Figure 1, and shows theVstone and mounting as associated with a lens and lens holder. l 1 YThe'primary object of the invention is to mount the bevel facedstone-'A15 upon a ball faced member 13k so that the stone may be 'Ytilted or rocked to any angle desired, and to Y G riarninirresroNn.

1926.. serial- No. 100,430.

described the drive shaft 10 is supported by the-journalsll and hasconnection with the 'belt and pulley 12 to properly dr-ixrethe saine.

jritirig olurlCE..

rThe ball faced lmembergl is vlr'eyedfto the shaft 10 by means of tghepin 14,.

` kThe stone l5 'having .the bevelled face 16 which is adapted toreceive an ophthalmic lens v17, is held between the clamp members18@whichare mounted on the outer edge of the stonesuppo-rting plate 19by means of the screws 20. The Ytwo ring members y21 and mounted on theinner end .of the plate member 319 bymeans .of the screws 23 are adaptedtoencirc-le the ball faced'member 13 Vand are chanifered around theirinner edges, kpreferably in y.arcuate yformationy rto 'forni ya bearingsurface 24 to receive the said ball faced member 13.

'A second plate member 2.5,

26 Iextending within the openings 27 formed i-,n the plate member 1.9 isrigidly having .the

mounted upon the ball `faced-member 18 by f the screws, or the like, 28.

The two springs 2,9 are adapted `be connecte@L at. ,one end tothe platemember 19 and at the yopposite yend to the arms 26 within 4.the`openings 2f?, and .are adapted to both pull in' the same direction.Asecond pair of springs 3() of equal tension to there Ysprings 29 'aremounted in the same manner 'as the said spr-ings 2-9 and are adapted topull inthe opposite dinection, Vthus lea-ving the stone 15 mounted in aneutral position, lor namely free from the ac tioniof the springs .otherthan toliold the same'in initial, `normal position on the ball facedmember 13, with a tendency always to return it thereto and free torespond to the slightest tilting y or rocking actionat the bevelled face16.

The lens 17 is supported by the usual lens clampsl carried by theshafts'32 and 33,

respectively, the latter of which supports the i former 311 and isdriven by the belt and pulley 85. Theformer 34 is adapted to engagethe'former shoe 36 andis held in engagement with the same by the spring,or the like, 37 Which tends to urge the lens carriage toward the stone15 during the edging of the lens.

The two {iange members 38 are adapted to `has to be rocked, The

housingr to keep the mounting and ball faced member 13 clean and freefrom grit or any waste material.

In operation the lens 17 is held between the clamping members 3l and ispositioned within the bevellcd face 16 of the stone 15. Power is thenapplied to the shaft l() by means of thc belt and pulley l2 and the ballfaced member 13 keyed to the shaft 10, alongr with the plate member Q5mounted on the ball faced member 13. is rotated at a suitable speed.

The arms 2G of the plate member 25 being connected by means of thesprings Q9 and 20 to the stone supporting plato 19. transmits power tothe stone l5.

The lens 17. together with the former r-lwhich determines the sire andshape of the lens. is rotated at a suitable speed through the belt andpulley 35 and is rotated in the oppositie direction as to the stonel.thereby causing a grindingr action to take place within the bevellcdface 16 which bevcls both sides of the lens sinmltaneously.

Duringr the bevel edging),r of a toric type lens 17, that is to say, alcns having a diicrent curvature in the two major nieridians. it will beseen b v reference to Figure il that an angle A exists, to which thestone has to be tilted, anda distance B from one axis of the lens to theother. to which the stone said movements taking place during the edging;operation as the stone follows the contour of the lens bcin;T edged.

It will be seen that with the construction shown and described I providea. mounting that will respond to the slightest movements necessariv inbevelline the edges of a lens. and that I have provided a structuresimple, strontr and durable, and well adapted for the purposes Atorwhich it is desinned.

Having,r described mv invention. I claim:

1. In a machine of the character dcscribed, a shaft, a ball member onthe shaft` means to rotate the shaft, a bearing member on the ballmember having a plurality of openings, a bevelled annular grindingI member secured to the bearing member. a member rotatable with the shafthaving' projections extending into the openings in `the hearing member,and resilient means secured to the projections and to the bearing;member. i

2. In a device of the character described, a shaft. means to rotate theshaft, an annular grindstone mounted on the shaft, a universalconnection between the grind stone and shaft, a member rotatable withthe shaft and resilient means connecting,r the grindstone and the memberrotatable with the shaft for driving the grindstone and to resilientlymaintain the grindstone in a position transverse to the shaft.

In a device of the character dcscribed. a shaft, means to rotate theshaft,

an annular grindstone mounted, on the shaft,

a movalile connection between the grindstone and shaft adapted to permitthe grindstone to be deflected from a position transverse to the shaft.a grindstonc driving,r member rotatable with the shaft, and resilientmeans connectiimr the grindstone and the member rotatable withthe shaftwhereby the rindstone is resilientlv driven and resilientl'v maintainedin a position transverse to the shaft.` i

el. In a device of the character de scribed, a shaft, means for rotatingthe shaft. an annular grindstone mounted on the shaft` a movableconnection between the grindstone and shaft adapted to permit the`efrindstone to be deficcted from a position transverse to the shaft. airrindstone drivinar member rotatable with thesliaft,` and a phiralityof springs connectingr the grindstonc and the member rotatable with theshaft iny a manner whereby power is exerted on some of the springs inone direction and on some oi the springs in the opposite direction.

`ALBERT E. MAYNARD.

